dieselsky

README

Dieselsky

Physical based sky rendering in go

This package allows you to create atmospheric renders into a disk in JPG format using GO!

Installation

go build
./dieselsky <height> <width> <clamped> <prefix>

For example

./dieselsky 4096 4096 true dome

Note: Atmosphere package assumes to be working in meters to include all physical phenomena including wavelengths astronomical measurements

Coefficients are based off of the surface layer coefficients for Rayleigh and Mie scattering phenomena future work can be done to move non normalized images into an HDR format for Global Environmental lights.

We can also extend the framework for atmosphere into a more generalized Rayleigh/Mie Scatter framework to allow for different Mie Scattering solutions during weather environmental changes and descriptions

This framework in the future should be updated to incorporate a handler for Electron Node dispatch requests

Include options for detailed Rayleight / Mie Scatter and height configurations for complete control over the model for users to include all configurable options

API Usage

Create a new atmosphere object and create textures

mSky := NewAtmosphere(45.0, 0.0)
mSky.SetDay(200.2)
base := "sky_"
for i := 0; i < 10; i++ {
  filename := base + strconv.FormatInt(int64(i), 10) + ".png"
  mSky.StepDay(1 + float32(i)/10)
  mSky.CreateTexture(256, 256, filename)
}

Notes

• Next update will fix the celestial observer model.
• Fixed Mie Scattering Error where sun disk failed to render
• Adjust Sky.Light.Lx.Flux settings for sun intensity. Default (20.5)
• Adjust Mie Scattering Phase Function by tuning g variable, forward scatter coefficient
• BetaR , BetaM correspond to the extinction coefficients in RGB tristimulus color space. Tune these vectors according to atmopsheric composition to affect atmospheric colors

Fixes

• Eliminate Negative View Vector Evaluations
• Faciliate Parameter Tuning for the Atmosphere Package as a whole with JSON Configurations
• Approximate depth integrals for Rayleigh Mie scattering with Pre-Packaged LUTs for algorithmic speedup
• Implement Volumetric Cloud Features
• Implement Ozone Extinction

Table of Measurements

phenomena	description	units	underlying units
Flux	Radiant Flux	Watts	kg m^2 s^-3
Wavelength	Electromagnetic Wavelength	Meters	m
Astronomical Units	Radii	Meters	m